C++ GDK_PIXBUF函數代碼示例

static void
redraw_viewer(void)
{
  flush_gdk_buffers();

  if (v_disparity_buffer)
  {
    gdk_draw_pixbuf(drawing_area->window,
        drawing_area->style->fg_gc[GTK_WIDGET_STATE (drawing_area)],
        GDK_PIXBUF(v_disparity_buffer), 0, 0, 0, 0,
        v_disparity_map->width,
        drawing_area->allocation.height,
        GDK_RGB_DITHER_NONE, 0, 0);
  }

  if (road_profile_buffer)
  {
    gdk_draw_pixbuf(drawing_area->window,
        drawing_area->style->fg_gc[GTK_WIDGET_STATE (drawing_area)],
        GDK_PIXBUF(road_profile_buffer), 0, 0, v_disparity_map->width + 10, 0,
        road_profile_image->width,
        drawing_area->allocation.height,
        GDK_RGB_DITHER_NONE, 0, 0);
  }

  if (right_buffer)
  {
    gdk_draw_pixbuf(drawing_area->window,
        drawing_area->style->fg_gc[GTK_WIDGET_STATE (drawing_area)],
        GDK_PIXBUF(right_buffer), 0, 0,  v_disparity_map->width + road_profile_image->width + 20, 0,
        right_image->width,
        drawing_area->allocation.height,
        GDK_RGB_DITHER_NONE, 0, 0);
  }
}

/* doesn't return a ref to the pixbuf */
static GdkPixbuf *
check_message_pixbuf (GstMessage * msg, const gchar * name, gint channels,
    gboolean has_alpha)
{
  GdkPixbuf *pixbuf;
  const GstStructure *s;

  fail_unless (gst_message_get_structure (msg) != NULL);

  s = gst_message_get_structure (msg);
  fail_unless_equals_string (gst_structure_get_name (s), name);

  fail_unless (gst_structure_has_field (s, "pixbuf"));
  fail_unless (gst_structure_has_field_typed (s, "pixel-aspect-ratio",
          GST_TYPE_FRACTION));
  pixbuf =
      GDK_PIXBUF (g_value_get_object (gst_structure_get_value (s, "pixbuf")));
  fail_unless (GDK_IS_PIXBUF (pixbuf));
  fail_unless_equals_int (gdk_pixbuf_get_n_channels (pixbuf), channels);
  fail_unless_equals_int (gdk_pixbuf_get_has_alpha (pixbuf), has_alpha);
  fail_unless_equals_int (gdk_pixbuf_get_width (pixbuf), 319);
  fail_unless_equals_int (gdk_pixbuf_get_height (pixbuf), 241);

  return pixbuf;
}

static VALUE
cview_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE text;
    VALUE with_markup = Qnil;
    GtkWidget *widget = NULL;

    rb_scan_args(argc, argv, "02", &text, &with_markup);
    
    if (NIL_P(text)) {
        widget = gtk_cell_view_new();
    } else {
        G_CHILD_SET(self, id_text, text);
        if (TYPE(text) == T_STRING){
            if (NIL_P(with_markup) || RVAL2CBOOL(with_markup)){
                widget = gtk_cell_view_new_with_markup(RVAL2CSTR(text));
            } else {
                widget = gtk_cell_view_new_with_text(RVAL2CSTR(text));
            }
        } else if (rb_obj_is_kind_of(text, GTYPE2CLASS(GDK_TYPE_PIXBUF))){
            widget = gtk_cell_view_new_with_pixbuf(GDK_PIXBUF(RVAL2GOBJ(text)));
        } else {
            rb_raise(rb_eArgError, 
                     "invalid argument %s (expect String or Gdk::Pixbuf)", 
                     rb_class2name(CLASS_OF(text)));
        }
    }

    RBGTK_INITIALIZE(self, widget);

    return Qnil;
}

/* GObject stuff */
static void
astro_contact_row_set_property (GObject      *object, 
                                guint         prop_id,
                                const GValue *value,
                                GParamSpec   *pspec)
{
  AstroContactRowPrivate *priv;
  
  g_return_if_fail (ASTRO_IS_CONTACT_ROW (object));
  priv = ASTRO_CONTACT_ROW (object)->priv;

  switch (prop_id)
  {
    case PROP_NAME:
      astro_contact_row_set_name (ASTRO_CONTACT_ROW (object),
                                  g_value_get_string (value));
      break;
    case PROP_ICON:
      astro_contact_row_set_icon (ASTRO_CONTACT_ROW (object),
                                  GDK_PIXBUF (g_value_get_object (value)));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
artwork_notify_cb (RhythmDB *db,
		   RhythmDBEntry *entry,
		   const char *property_name,
		   const GValue *metadata,
		   RBMtpSource *source)
{
	RBMtpSourcePrivate *priv = MTP_SOURCE_GET_PRIVATE (source);
	GdkPixbuf *pixbuf;
	const char *album_name;

	album_name = rhythmdb_entry_get_string (entry, RHYTHMDB_PROP_ALBUM);

	/* check if we're looking for art for this entry, and if we actually got some */
	if (g_hash_table_remove (priv->artwork_request_map, album_name) == FALSE)
		return;

	if (G_VALUE_HOLDS (metadata, GDK_TYPE_PIXBUF) == FALSE)
		return;

	pixbuf = GDK_PIXBUF (g_value_get_object (metadata));

	rb_mtp_thread_set_album_image (priv->device_thread, album_name, pixbuf);
	queue_free_space_update (source);
}

static void
art_cb (RBExtDBKey *key, const char *filename, GValue *data, MxFrame *frame)
{
    ClutterActor *image;
    GdkPixbuf *pixbuf;

    if (data == NULL || G_VALUE_HOLDS (data, GDK_TYPE_PIXBUF) == FALSE) {
        return;
    }

    clutter_threads_enter ();

    image = gtk_clutter_texture_new ();
    pixbuf = GDK_PIXBUF (g_value_get_object (data));
    gtk_clutter_texture_set_from_pixbuf (GTK_CLUTTER_TEXTURE (image), pixbuf, NULL);
    if (clutter_actor_get_height (image) > MAX_IMAGE_HEIGHT) {
        clutter_actor_set_height (image, MAX_IMAGE_HEIGHT);
        clutter_texture_set_keep_aspect_ratio (CLUTTER_TEXTURE (image), TRUE);
    }
    if (clutter_actor_get_width (image) > MAX_IMAGE_HEIGHT) {
        clutter_actor_set_width (image, MAX_IMAGE_HEIGHT);
    }
    mx_bin_set_child (MX_BIN (frame), image);
    clutter_actor_show_all (CLUTTER_ACTOR (frame));

    clutter_threads_leave ();
}

static VALUE
rg_s_from_image(int argc, VALUE *argv, G_GNUC_UNUSED VALUE self)
{
    VALUE cmap, src, src_x, src_y, width, height, dest, dest_x, dest_y;
    GdkPixbuf* buf;

    rb_scan_args(argc, argv, "63", &cmap, &src, &src_x, &src_y, &width, &height, 
                 &dest, &dest_x, &dest_y);

    buf = gdk_pixbuf_get_from_image(GDK_PIXBUF(RVAL2GOBJ(dest)),
                                    GDK_IMAGE(RVAL2GOBJ(src)),
                                    GDK_COLORMAP(RVAL2GOBJ(cmap)),
                                    NUM2INT(src_x), NUM2INT(src_y),
                                    NIL_P(dest_x) ? 0 : NUM2INT(dest_x),
                                    NIL_P(dest_y) ? 0 : NUM2INT(dest_y),
                                    NUM2INT(width), NUM2INT(height));
    if (NIL_P(dest)) {
        if (buf) {
            return GOBJ2RVAL(buf);
        } else {
            return Qnil;
        }
    } else {
        return dest;
    }
}

static void
on_sliced_image_loaded (GObject *source_object,
                        GAsyncResult *res,
                        gpointer user_data)
{
  GObject *cache = source_object;
  AsyncImageData *data = (AsyncImageData *)user_data;
  GTask *task = G_TASK (res);
  GList *list, *pixbufs;

  if (g_task_had_error (task))
    return;

  pixbufs = g_task_propagate_pointer (task, NULL);

  for (list = pixbufs; list; list = list->next)
    {
      ClutterActor *actor = load_from_pixbuf (GDK_PIXBUF (list->data));
      clutter_actor_hide (actor);
      clutter_actor_add_child (data->actor, actor);
    }

  g_list_free_full (pixbufs, g_object_unref);

  if (data->load_callback != NULL)
    data->load_callback (cache, data->load_callback_data);
}

static VALUE
it_s_add_builtin_icon(VALUE self, VALUE icon_name, VALUE size, VALUE pixbuf)
{
    gtk_icon_theme_add_builtin_icon(RVAL2CSTR(icon_name), NUM2INT(size),
                                    GDK_PIXBUF(RVAL2GOBJ(pixbuf)));
    return self;
}

/*! \brief Get fallback pixbuf for displaying pictures.
 * \par Function Description
 * Returns a pixbuf containing the fallback image to be used if a
 * picture object fails to load.  The returned pixbuf should be freed
 * with g_object_unref() when no longer needed.
 *
 * \return a #GdkPixbuf containing a warning image.
 */
GdkPixbuf *
o_picture_get_fallback_pixbuf (TOPLEVEL *toplevel)
{
  static GdkPixbuf *pixbuf = NULL;
  static gboolean failed = FALSE;

  if (pixbuf == NULL && !failed) {
    gchar *filename;
    GError *error = NULL;

    filename = g_build_filename (toplevel->bitmap_directory,
                                 "gschem-warning.png", NULL);
    pixbuf = gdk_pixbuf_new_from_file (filename, &error);

    if (pixbuf == NULL) {
      g_warning ( _("Failed to load fallback image %1$s: %2$s.\n"),
                  filename, error->message);
      g_error_free (error);
      failed = TRUE;
    }
    g_free (filename);
  }

  if (failed) return NULL;

  g_assert (GDK_IS_PIXBUF (pixbuf));
  return GDK_PIXBUF (g_object_ref (pixbuf));
}

static gboolean write_image(GObject* image, const char* filename)
{
    char *keys[11]; /* enough for known keys + 1 */
    char *vals[11];
    GdkPixbuf *pix = GDK_PIXBUF(image);
    char *known_keys[] = { "tEXt::Thumb::URI", "tEXt::Thumb::MTime",
                           "tEXt::Thumb::Size", "tEXt::Thumb::Mimetype",
                           "tEXt::Description", "tEXt::Software",
                           "tEXt::Thumb::Image::Width", "tEXt::Thumb::Image::Height",
                           "tEXt::Thumb::Document::Pages", "tEXt::Thumb::Movie::Length" };
    guint i, x;

    /* unfortunately GdkPixbuf APIs does not contain API to get
       list of options that are set, neither there is API to save
       the file with all options, so all we can do now is to scan
       options for known ones and save them into target file */
    for (i = 0, x = 0; i < G_N_ELEMENTS(known_keys); i++)
    {
        const char *val = gdk_pixbuf_get_option(pix, known_keys[i]);
        if (val)
        {
            keys[x] = known_keys[i];
            vals[x] = (char*)val;
            x++;
        }
    }
    keys[x] = NULL;
    vals[x] = NULL;
    return gdk_pixbuf_savev(pix, filename, "png", keys, vals, NULL);
}

static void
dump_thumbs (Itdb_PhotoDB *db, Itdb_Artwork *artwork,
	     const gchar *album_name, const gchar *dir)
{
	GList *it;
	gint i = 0;
        GList *thumbnails;

        thumbnails = itdb_thumb_to_pixbufs (db->device, artwork->thumbnail);
	for (it = thumbnails; it != NULL; it = it->next, i++) {
		gchar *filename, *path;
                GdkPixbuf *pixbuf;

                pixbuf = GDK_PIXBUF (it->data);

		g_return_if_fail (pixbuf);

		filename = g_strdup_printf ("%s-%d-%d.png",
					    album_name, artwork->id, i );
		path = g_build_filename (dir, filename, NULL);
		g_free (filename);
		gdk_pixbuf_save (pixbuf, path, "png", NULL, NULL);
		g_object_unref (pixbuf);
		g_free (path);
	}
        g_list_free (thumbnails);
}

static VALUE
rg_m_set_icon(int argc, VALUE *argv, VALUE self)
{
    VALUE context, obj, pixmap = Qnil, mask = Qnil, hot_x, hot_y;

    if (argc == 6) {
        rb_scan_args(argc, argv, "60", &context, &obj, &pixmap, &mask, &hot_x, &hot_y);
        gtk_drag_set_icon_pixmap(RVAL2DC(context),
                                 GDK_COLORMAP(RVAL2GOBJ(obj)), 
                                 GDK_PIXMAP(RVAL2GOBJ(pixmap)),
                                 GDK_BITMAP(RVAL2GOBJ(mask)), 
                                 NUM2INT(hot_x), NUM2INT(hot_y));
    } else {
        rb_scan_args(argc, argv, "40", &context, &obj, &hot_x, &hot_y);

        if (TYPE(obj) == T_SYMBOL){
            gtk_drag_set_icon_stock(RVAL2DC(context), rb_id2name(SYM2ID(obj)),
                                    NUM2INT(hot_x), NUM2INT(hot_y));
        } else if (rb_obj_is_kind_of(obj, GTYPE2CLASS(GTK_TYPE_WIDGET))){
            gtk_drag_set_icon_widget(RVAL2DC(context), RVAL2WIDGET(obj),
                                     NUM2INT(hot_x), NUM2INT(hot_y));
        } else if (rb_obj_is_kind_of(obj, GTYPE2CLASS(GDK_TYPE_PIXBUF))){
            gtk_drag_set_icon_pixbuf(RVAL2DC(context),
                                     GDK_PIXBUF(RVAL2GOBJ(obj)),
                                     NUM2INT(hot_x), NUM2INT(hot_y));
        } else {
            rb_raise(rb_eArgError, "invalid argument %s", rb_class2name(CLASS_OF(obj)));
        }
    }
    return self;
}

PyObject *
gdkpixbuf_get_pixels_array(PyObject *pixbuf_pyobject)
{
    GdkPixbuf *pixbuf = GDK_PIXBUF(((PyGObject *)pixbuf_pyobject)->obj);
    PyArrayObject *array;
    npy_intp dims[3] = { 0, 0, 3 };

    dims[0] = gdk_pixbuf_get_height(pixbuf);
    dims[1] = gdk_pixbuf_get_width(pixbuf);

    if (gdk_pixbuf_get_has_alpha(pixbuf))
        dims[2] = 4;
    guchar *pixels = gdk_pixbuf_get_pixels(pixbuf);

    array = (PyArrayObject *)PyArray_SimpleNewFromData(3, dims, NPY_UBYTE,
                                                       pixels);

    if (array == NULL)
        return NULL;

    PyArray_STRIDES(array)[0] = gdk_pixbuf_get_rowstride(pixbuf);
    // the array holds a ref to the pixbuf pixels through this wrapper
    Py_INCREF(pixbuf_pyobject);

#ifdef NPY_1_7_API_VERSION
    PyArray_SetBaseObject(array, (PyObject *)pixbuf_pyobject);
#else
    array->base = (PyObject *)pixbuf_pyobject;
#endif

    return PyArray_Return(array);
}

static GeglRectangle
get_bounding_box (GeglOperation *operation)
{
  GeglProperties   *o = GEGL_PROPERTIES (operation);
  GeglRectangle result = {0,0,0,0};

  if (!o->pixbuf)
    {
      return result;
    }

  result.x = 0;
  result.y = 0;
  result.width  = gdk_pixbuf_get_width (GDK_PIXBUF (o->pixbuf));
  result.height = gdk_pixbuf_get_height (GDK_PIXBUF (o->pixbuf));
  return result;
}